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P: Plasmaphysik

P 12: Plasma Wall Interaction, Diagnostic and Low Temperature Discharges (Poster Session)

P 12.11: Poster

Freitag, 6. April 2001, 12:30–15:00, AT2

Monte-Carlo simulations of erosion and redeposition at the ITER divertor plates — •A. Kirschner¹, V. Philipps¹, P. Wienhold¹, A.S. Kukushkin², and C. Wu³ — ¹Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, 52425 Jülich — ²ITER Joint Central Team, Garching Joint Worksite, 85748 Garching — ³EFDA, Max-Planck-Institut für Plasmaphysik, 85748 Garching

The transport of eroded particles in fusion devices influences the lifetime of wall elements and in the case of carbon based materials the tritium codeposition and is therefore an important issue.

Using an adapted version of the Monte-Carlo code ERO-TEXTOR simulations of the local transport of chemically eroded particles were carried out for the divertor of ITER. The plasma parameters (temperature and density) were taken from B2-EIRENE calculations for the ITER FEAT geometry with a separatrix density at the outer mid-plane of 3e19 m⁻³. The assumption of fully sticking for hydrocarbons returning to the divertor plates results in an integral redeposition of 94% at the inner and 96% at the outer divertor plate. The assumption of zero sticking reduces the redeposition to 83% at the inner and 88% at the outer target. Due to the high redeposition rates the lifetime of the plates should be not crucial whereas the codeposition of tritium could become problematic.